It has never been cheaper to learn new skills. These 22 sites give you the opportunity to learn various skills from technology, science, business, ...
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If you are looking to develop a skill in a specific niche, I would recommend looking for resources that are recommended by the project, e.g. I like Solana's developer resources a lot, as they offer courses for all skill-levels:
solana.com/developers
dont forget w3 school ..follow back for more insightful discussion